Metal-cutting tool



Aug. 17 1926;

P. J. LlNDGREN METAL cu'r'rms TOOL Filed April 21. 1924 Patented Aug.17, 1926.

UNITED STATES [PETER J. LINDGREN,

ATJENT OFFICE.

or DENVER, coLoR-Ano, Assrenoa' roa. w, nonniin, or QDENVER, COLORADO.

METAL-CU TING TOOL.

Application'filed April 21, 1924. Serial No. 707,933.

' An object of this inventionjis to provide improved means for cuttingcircular holes in metal bodies such as the wallsand ends of tanks andcontainers;

A further object of this invention is to provide an improvedconstruction for a metal-cutting tool.

A further object of this invention is to provide'im'proved means forretaining a substantially-annular hacksaw in a metalcutting tool.

'A-:turther object of this'invention is to provide means for carrying adrill and a substantially-annular hacksaw in-concentric relation, therespective carrying means being separableand distinct from each otherand adapted to be assembled and rigidly joined for use. 7

A further object of this invention is to provide a two-part tool, onepart being adapted to carry a hacksaw, the other part being adapted tocarry a drill and also to carry the first part, and means for rigidly,yet detachably, connecting said Parts, the hacksaw and the drill forconjunctive use.

A further object of this invention is to provide a two-part tool, onepart being adapted to carry a drill and having means for securing thepart against rotation relative to the drill, the other part beingadapted to carry a substantially-annular hacksaw concentric with thedrill and also adapted to be'mounted on the first part and rigidly, yetdetachably, secured thereto, the drillretaining means also fixing anddetermin-- ing relative rotation of the two parts of the tool.

provide a two-part tool, one part being adapted to be mounted rigidly,yet detacl 1-' ably, on and concentric with a drill, sald drill beingadapted to be mounted removably in an operating device, the other partof the tool being adapted to be mounted on and concentric with the firstpart and adapted to carry a substantially-annular ha'cksaw concentricwith-said drill, there be ing a common means employed to prevent providea two-part tool, one part being formed with internal rabbet adapted toreceive a substantially-annular hacksaw and also adapted to receive anexpansive friction-locking ring within said hacksaw, the other part ofthe tool being formed with'a cone adapted to bear outwardly on the ringand also'being formed with a neck or shank adapted to pass through thefirst part and be so locked thereto and to adjust the pressure of thecone on the ring.

A further object of this invention is to provide atwo-part tool, onepart being formed with an internal rabbet and a bore centrally of saidirabbet, the rabbet being adapted to receive a vsubstantially-annularhacksaw and also adapted to receive an expansive ring within the arcof;and pressing outwardly on said hacksaw,the other part of the toolbeing formed witha neckor shank adapted to pass through the bore of thefirst part and also formed with a barrel or hub adapted to fit looselyWithin the first part and, also formed with a cone adapted to engage theinterior arc ofand outwardly press the expansive ring, and also formedwith a radial bore adapted to receive a set screw in turn adapted toengage a drill arrangedaxially of the second part, the first part beingformed with a notch, intersecting the rabbet, hacksaw and ring andadapted to receive the set screw, there being means provided 'forlocking the parts together. y I

My invention consists in the construction, arrangement and combinationof elements hereinafter set vforth, pointed out in the claims andillustrated by drawing, in which'- Figure 1 is an elevation of thecomplete tool assembled as required for practical use. Figure 2 is alongitudinal section axially of the same, the drill and set screw beingshown in full. Figure 3 is a bottom or cutting end view of the completetool. Figure 4 is a view similar to Figure 3, the inner part of thetoolv being removed. Figure 5 is a View similar to Figure 4, the hacksawand ring being removed. Figure 6 is an elevation of the inner part ofthe tool removed from the other elements, dotted lines indicating axialand radial bores therein to receive a drill and set screw respectively.

In the construction of the tool as shown the numeral 10 designates anouter part or shell, which is generally cylindrical in form theaccompanying [the notch 15.

and: has an integralnut 11 on one end. The interior of the shell part 10is circular and of .three diameters; being formed with a rabbet 12'atone end, said rabbethaving an oblique or inclined bottom "forming atrough of annular form; the shell also being termed with an intermediatechamber 13 opening at one end through therabbetg and the shell alsobeing formed with a central bore ll .openingfrom the opposite end of thecham- .ber .13.. Anotch 15 is formed in andradialuly ofthe shell.l0 andintersects therabbet .12 andchamber 13. Ahacksaw .16, substan- .tiallyannular in .form, is mounted in the v.rabbet .12 and, because ofinherenttendency .fto expand, bears against the wall ofthe ra'o- .bet,the spaced. ends of the hacksaw providing .a .notch. orpassagecoincident .With the notch 15. The toothed margin of the hacksawis. outermost, being spaced {fromv the adjacentend of the shell 10 acustancegreater ,than any contemplated penetration oft-he saw 1nv aworlpobyecutand. the inner smooth margin, ot. thezhaclzsaw seats in thebottom b =ot thetrough oftherabbet. An expansive spring ring .17,.oreterably .ma-cte of round wire, substantially annular in vtorm, is

.mounted in the trough oft-he rabbet 12 and bears, by spring. pressure,on the mnersun face of the haclrsaw opposite, to and resisted :by the.wallof the rabbet, the spaced ends of .the ringproviding. apassagecoincident ,with

An inner part or core comprises three integralmembers, viz, apbarrel.orhub .18. adapted to lit. loosely in the charm ber 13, a cone .19 at.one end .01 the hub adapted to .enter the .rabbet .12 and bear against.the inner surface-0t. the ring 17, and

a. stem, neck or. shank 20 at the opposite-end of the ':hub..adapt-ed toextend through the centralbore 14L, thetlatter beingthreaded to receivea nut 21. The core is tormedpwith an axial.boreadaptedto receive a drill22 and also is formed with aradial-boreadapted to receive aset-screw-23,.the latter bore being threaded. -The drill :22 is termedwith a flat seat between its. ends and. the inner. end ottheset-screw-23engages said seat .andconnectsthe coreto the drill inrespect of :both circumferential and longitudinal movement of eitherrelative to the other. .Theset-screw 23 is relatively long, andis.adaptedtoextend through the.notch;1 5 and through the spaces.betweenthe ends of the hacksaw and of the ring 17 and,,under somecircumstances, such as anoverload on the spring ring, said setescrew maybeengaged by an end of the hacksaw and: limit circumterential vmovementthereof relative to the shell. Before the nut21 is applied tothe stem20, .the core, with the, drill. 22.a11d set-- screw23'assembledthereiinmay be inserted in the :shell so that. the set-screw enters thenotch 15 and the stem passes, through the bore 14, after which the nutis applied and tightened against theouterend of the shell by a Wrenchapplied thereto, the shell being held stationary by engaging itin a viseor wrench applied to the nut l l'thereon. Tightening ot the nut 21 drawsthe cone .19 within and causes it to press outwardly on andexpand thering 17, thereby apply- ;ing greatpressure to the inner surface of thehacksaw and clamping it firmly,

throughout its length, to the wall otthe rabbetzl2, to. the-endofpreventingany circumferential movement of the hack'saw relative to theshell; The drill maybe removed and ,replaced, ,or substituted by anvvothitheu r n in th r from th shell, through manipugation of the setscrew23.

The asse l d to lmayb emp oyed .i cutting a roundhole in a work objectsucitlas a boiler, tank or container, by'applying to the drillanoperating device 's uch as a brace ,or boring machine or flexible shaftand .rota ina h tod; a slent rine 1 .109-

par frame-on p b ieena l pt cltoe0 .tain. and car ya ub n l yr nn la bas.saw radi y engag ngh inn iac th reo the other part be ng ad pte o r i al;v a .drill cen rall of th hackaw, mean betweensaid parts acted on,bynthe 5609116. part :for applying radial pressure .to i said =hacksawand means for connecting said {frame parts.

, 2. A metal-cutting: tool omprising, a twopart frame, one part beingformed with a .rabbet adapted to conta n a substan ia yannular hacksaw,the other part ,rbeing linountedaxially of thefirst part. andiormied.with a cone adapted to apply radial pressure ;to said :hacksaw, theinner part also being adapted to@ contain. a drill, an-d means forconnecting said frame parts.

3. A ,metaleioutting. tool comprising a twopart trame,.one part beingformed with .an internal .rabbet haying a F t rough in its bottom, asubstantially annular hacksiaw mounted in said rabbet and having its vtoothed margin spaced from the ,end of the rabbet, anexpansivedevice,mountedinsaid .ltrough ,andoengaging the inner surtacefof thehacksaw, the other part of the .;:Erame being formed with aconeadaptedtoengage and expand said 1 device, means tonconneca ing saidframe parts, and a drill mounted and apply radial pressure to saidhack-saw,

and also formed with a central bore and a radial bore intersecting thecentral bore, means for connecting said frame parts and separate cuttingdevices mounted on the respective frame parts.

5. A metal-cutting tool comprising a twopart frame, one part beingformed as a shell and the other part as a core, adapted to enter theshell and having a stem extending through the opposite end of the shell,a sub stantially-annular hacksaw mounted in the shell, a retaining ringmounted within and expansively engaging said hacksaw, the core having apart adapted to expansively engage said ring, a drill mounted in thecore axially of the hacksaw and projecting therefrom at both ends, and anut adapted to be mounted on said stem and adapted to engage theadjacent end of the shell.

6. In a metal-cutting tool, a shell, a substantially-annular hacksawmounted loosely in and projecting from one end of said shell, a coreremovably mounted through said shell and adapted to apply outwardpressure to said hacksaw, said shell being formed with a radial notch,said core being formed with a central bore and also formed with a radialbore intersecting said central bore and intersecting said notch, a drillremovably and replaceably mounted in the central bore of the core and aset-screw mounted in said radial bore of the core and traversing saidnotch.

7 In a metal-cutting tool, a shell, a' substantially-annular haAcksa-wmounted in and projecting from one end of said shell, an open ringmounted within said hacksaw, a core mounted through said shell andformed with an expanding face adapted to engage said open ring, saidcore also being formed with a central bore and a radial boreintersecting it, said shellbeing formed with a radial notch registeringwith the radial bore, the spaces between the ends of the saw and betweenthe ends of the open ring registering with said notch, a drill mountedin the central bore and a set screw mounted in the radial bore andextending through the saw and ring spaces, together with means forconnecting said shell and bore.

8. A metal-cutting tool comprising a twopart frame, one part beingformed with an internal rabbet, a substantially-annular hack-saw mountedin said rabbet, an expan sive device mounted in said rabbet and 7 PETERJ. LINDGREN.

